Video: Dab tsi yog qhov txwv ntawm kev hloov kho kev tsim qauv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
• txwv ntawm alternating kho designs : o Nws yog raug rau ntau yam kev kho mob cuam tshuam, o ceev rov qab-thiab-tawm mus hloov ntawm kev kho mob tsis muaj kev cuam tshuam txog cov yam ntxwv uas siv los cuam tshuam thiab yuav raug suav tias yog khoom cuav thiab tsis xav tau.
Tsis tas li ntawd, dab tsi yog qhov zoo ntawm kev hloov kho kev tsim qauv?
Qhov zoo ntawm Alternating Treatments Design . Tsis xav rho tawm, ceev sib piv ntawm kev kho mob , Minimizes irreversibility teeb meem, Minimizes sequence cuam tshuam, yuav siv tau nrog cov ntaub ntawv tsis ruaj tsis khov, tuaj yeem raug foob los ntsuas qhov dav dav, tuaj yeem pib tam sim.
Ib tug kuj yuav nug, leej twg ntawm cov hauv qab no yog suav tias yog kev txwv ntawm kev siv ntau yam kev kho mob rov qab tsim? Sequence effect yog suav tias yog ib qho kev txwv ntawm kev siv ntau yam kev kho mob rov qab tsim . Kev cuam tshuam ib ntus yog qhov cuam tshuam ntawm tus neeg kawm tus cwj pwm hauv ib qho xwm txheej uas yog tshwm sim los ntawm tus neeg kawm qhov kev paub dhau los nrog qhov xwm txheej ua ntej.
Ua raws li qhov no hauv kev xav, dab tsi yog qhov kev hloov kho kev tsim kho?
alternating kev kho mob tsim . ib hom kev kawm nyob rau hauv uas qhov kev sim mob los yog kev kho mob muab rau cov neeg koom nrog kev hloov pauv los ntawm kev sib tham mus rau kev sib tham lossis hauv ntu.
Dab tsi yog qhov txawv ntawm ntau lub hauv paus tsim thiab kev tsim kho kev hloov pauv?
A tsim ntau yam tseem hu ua ib alternating kev kho mob tsim , vim nws ntsuas cov nyhuv ntawm ntau yam kev kho mob xa ib tom qab lwm tus. Piv txwv li, ob kev kho mob tej zaum yuav muab piv hauv xaj kom pom qhov twg yog qhov ua tau zoo tshaj plaws hauv tsim lub hom phiaj tus cwj pwm.
Pom zoo:
Dab tsi yog qhov tsim qauv tsim qauv tsim thiab lub cev database tsim?
Logical database modeling suav nrog; ERD, daim duab ua lag luam, thiab cov ntaub ntawv tawm tswv yim rau cov neeg siv; whereasphysical database modeling suav nrog; server qauv daim duab, database tsim cov ntaub ntawv, thiab cov neeg siv cov ntaub ntawv tawm tswv yim
Dab tsi yog qhov zoo ntawm txheej txheej rau kev tsim qauv hauv kev khiav hauj lwm qhov system?
Nrog rau txheej txheej, txheej hauv qab yog cov khoom siv kho vajtse, thaum txheej siab tshaj plaws yog cov neeg siv interface. Lub ntsiab kom zoo dua yog simplicity ntawm kev tsim kho thiab debugging. Qhov teeb meem tseem ceeb yog txhais cov txheej txheem ntau yam. Lub ntsiab tsis zoo yog tias OS nyiam ua haujlwm tsawg dua li lwm yam kev siv
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Dab tsi yog qhov zoo ntawm kev hloov kho kev tsim qauv?
Hloov kho kev tsim qauv muaj qhov zoo hauv qab no: Kev sib piv kev cuam tshuam zoo. Nws tsis tas yuav rho tawm. Nws tuaj yeem siv los ntsuas cov teebmeem dav dav. Nws tsis suav nrog qhov rov qab mus rau qhov pib
Dab tsi yog qhov kev txwv kev ncaj ncees piav qhia txog kev ncaj ncees lossis kev txwv txawv teb chaws?
Kev lees paub ncaj ncees xav kom tus yuam sij txawv teb chaws yuav tsum muaj tus yuam sij tseem ceeb sib xws lossis nws yuav tsum yog null. Qhov kev txwv no tau teev tseg ntawm ob lub rooj (niam txiv thiab menyuam); nws tuav cov ntawv xov xwm ntawm kab hauv cov rooj no. Nws txhais tau hais tias kev siv los ntawm kab hauv ib lub rooj mus rau lwm lub rooj yuav tsum siv tau